butler



2 Sheets-Sheet 1. BUTLER 8v T. MGFBELY.

MIDDLINGS PURIFIER.

Patented Peb. 3, 1885.

(No Model.)

[GEL

(N0-Model.) l 2 Sheets-Sheet 2. E. T. BUTLER & T. MGFBELY. MIDDLINGS PURIFIBR.

No. 811,808. Patented 1168.3, 1885.

pnola-umugupher. washington, D4 c.

UNITED STATES PATENT OEEIcE.

ELI BUTLER AND THOMAS MGFEELY, OF PHILADELPHIA, PENNSYLVANIA vASSIGNORS TO SAID MCFEELY, SAMUEL E; GRISCOM, AND VALTER GRIS- COM, ALL OF SAME PLACE.

MIDDLINGS-PURIFIER.

SFECIFICATION forming part of Letters Patent No. 311,808, dated February 3, 1885.

Application tiled Aprl I4, 1894. (No model.) i

To all whom, it may concern:

- Be it known that we, ELT T. BUTLER and THoMAs MoFEELY, citizens of the United States, and residents of Philadelphia, Pennsylvania, have invented certain Improvements in Middlings-Puriiiers, of which 4the following is a speciication. Y

Our invention consists of certain improvements in that class of cleaners and separators in which the crushed grain is fed from a primary rotating screen having a graded mesh onto a series of secondary shaking screens, each having a mesh to accord with the grade of material supplied thereto, the objects of our improvements being to dispense with the use of brushes or other cleaners on these secondary screens, and to so regulate the blast as to insure the most effective separation.

In the accompanying drawings, Figure l7 Sheet l, is a* transverse section of apparatus constructed in accordance with our invention, and Fig. 2, Sheet 2, a longitudinal section of the same.

A -is the casing ofthe apparatus, which has in the upper end a fan-box, B, and bearings for a longitudinal rotary screen, D, of any ofthe usual constructions, and clothed with gauze of different degrees of tineness, three degrees of mesh being shown in the drawings, for eX- ample, although there may be but two grades or more than three grades. In the casing A, beneath the screen D, are three transverse shaking screens, F, one for each gage of gauze on the screen D, and in this portion of the casing are vertical partitions G, which divide it into three independent chambers, H, one for each screen F, and each of these chambers beneath the screen is further subdivided by partitions I I into three chambers, K, M, and N each of which has a suitable dischargespout and conveyer. The fan-box B communicates with each of the chambers H through openings a, provided with valves b, the Valve mechanism of each chamber being independent of that of the others, so that the blast through any one of the screens may be controlled without affecting the blast through either ofthe others, the air entering openings d in the casing A beneath the screens F. Each screen F is furnished with gauze one grade coarser than 5o that of the section of screen D from which it receives its supply of material. The separation effected by the rotating screen vD is a primary separation into different grades, while that effected by the screens F is a secondary sepa- 5 5 the screens and discharged into the chambers 6o M, and still others intothe tailing-chamber N, while the light particles and fluff are carried up by the blast into the fan-box B, the strength of blast being regulated by the valves b. ,The providing of the secondary screens 65 with gauze of a grade coarser than that of the section of screen D which supplies the secondary screen, and the maintenance of an upward draft of air through said secondany screens, are the important features of our in- 7c vention7 as the desired separation of the material can be effected without risk of clogging the secondary screen, and without the necessity of using brushes, beaters, or other devices for keeping the screen clean. The sepa- 75 ration of the material on the secondary screen by ganze of coarser mesh than that through which the material passed in the primary screen is due to the fact that in the secondary screen the material is simply subjected to a 8o shaking action, and is under the inliuence of a lifting blast of air, whereas in the primary or rotating screen the material is lifted and allowed to fall, so that it is driven through the meshes of the gauze with which said screen 8 5 is covered. The receiving end of thegchamber K may be contracted and the receiving end of the chamber M correspondingly enlarged by the adjustment of the partition l',

separating said chambers, this partition being 9o pi voted for the purpose, and the adjustment being in accord with the character ofthe material which is being fed onto the screen. The material from the second chamber M may be returned to the rotary screen and again passed 9 5 through the apparatus, if desired.

It will be observed that owing to the system of partitions G each screen is contained in a separate blast-chamber, so thatthe force of thewblast'thoiigh each screen may' bejregulated independently "of the'others to suit the particular grade of material which is being fed to-that screen, the effective and equable action of the blast being thus insured.

It will ,be observed that, owing -to thel arrangement ofV the fan-box B, air-inlets Land partitions I, all the air Which passes through the rear portion of each screen F (that is to say, the portion nearest the discharge end) must first pass over the top ofthe partition beneath said screen. This causes a blast along the bottom of the screen, and serves to separate from the-material passing through-the head of the screen the lighter particles, which are carried over the partition and deposited in the chamber M, a further purification of the material in the chamber 'K being rrthus ef-` may*` suggest, thev shakingvmovementbeing l effectedby eccentries on the vdriving-shaft m.

lThe systemjof beltsvwherebythe'if rotating screen, fan, and conveyerssare .d riven is shown by dotted lines in Fig. l, and will be readily understood Without description.

Ve do not claim, broadly, rst grading the material byymeaus o a primaryfscreen,and

then feeding'each grade onto the Vhead of a .-secoiidary'shaking screen especially adapted for treatingjthat particular grade, as :this has been heretofore proposed; but

We claim as our invention and desire to secure by Letters Patent-4 The combination, in a separator, of a primary rotating screen,4 a, series of .secondary shaking screens, each receiving a special grade of material from said primary screen, and each having gauze of coarser grade than that of the section of primary .screenvsupplying i the material thereto, and means,lsubstanti al1y as described, for producing.anfupward draft of air through the meshes of the-shaking screens, as specified.

' In` testi'mony whereofl We havehsignedqour names'to this specification in the ,presence of two subscribing Witnesses.`

. ELIT. BUTLER.` Witnesses:

l JoHN M. CLAYTON, HARRY SMITH.

'THOMAS MCrnELY-Qf 

